Adjustable variable delivery pump



June 2, 1970 v. M. JEMISON ADJUSTABLE VARIABLE DELIVERY PUMP Filed July 18, 1968 INVENTOR. VOL/V5) /Z JEN/50M ATTORNEY.

United States Patent 3,515,016 ADJUSTABLE VARIABLE DELIVERY PUMP Volney M. Jemison, Phoenix, Ariz., assignor to Minijector Corp., Phoenix, Ariz., a corporation of Arizona Filed July 18, 1968, Ser. No. 745,902 Int. Cl. F0411 7/06, 19/22, 49/00 US. Cl. 74-828 1 Claim ABSTRACT OF THE DISCLOSURE An adjustable variable delivery pump having a rotating and reciprocating pump plunger having an angular groove engaging a stroke controlling ball bearing operating in a lost motion slot together with adjustable control means to vary the amount of lost motion movement of the stroke controlling ball to vary the output of the pump.

BACKGROUND OF THE INVENTION SUMMARY OF THE INVENTION One of the objects of this invention is to provide an adjustable variable delivery pump having a spiral actuating groove with mechanisms to change the position of the element operating in the spiral groove so as to vary the stroke and delivery of the pump.

A further object is to provide a lost motion varying device for a spiral groove engaging element of the rotary reciprocating plunger of the pump.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side elevation of an adjustable variable delivery pump incorporating the features of this invention.

FIG. 2 is a sectional view of the pump shown by the line 22 in FIG. 1.

FIG. 3 is an enlarged fragmentary sectional view on the line 33 of FIG. 2.

FIG. 4 is an enlarged fragmentar sectional view on the line 4-4 of FIG. 3.

FIG. 5 is an enlarged sectional view on the line 5-5 :of FIG. 3.

FIG. 6 is an enlarged sectional view on the line 66 of FIG. 2.

DESCRIPTION OF THE PREFERRED EMBODIMENT As an example of a preferred embodiment there is shown a pump having a pump body 10 having a bore 11 in which is rotatably and reciprocatably carried the pump plunger 12. Longitudinally spaced intake port 13 "iceand exhaust port 14 are formed in the body 10 cooperating with passageways 15 and 16 formed in the plunger 12, which passageways are in communication with the common longitudinal passageway 17 opening at 18 at the head of the plunger 12 so as to communicate with the cylinder bore chamber 19 formed by the bore 11.

The plunger is rotated by a suitable motor 20 mounted on the body 10 by an appropriate motor support frame 21. The motor 20 has an output shaft 22 upon which is axially slidable a driver member 23 in turn rotatively driven by a pin 24 fixed in the motor shaft 22 and extending into the elongated slots 25 formed in the driver member 23. An outwardly extending tongue 26 is formed on the driver member which is received in a mating radially disposed slot 27 formed in the outer end 28 of the plunger 12 so that the plunger 12 is free to axially reciprocate as it is rotated by the motor 20.

Reciprocation of the plunger 12 is accomplished during the rotation of the plunger by the motor by a spiral groove 29 formed in the periphery 30 of the plunger which is engaged by the stroke control ball 31 which is carried in an elongated longitudinally extending slot 32 formed in the body 10 and merging with the bore 12. The ball 31 has lost motion travel in slot 32 between the underside surface 33 of the stop screw 34 threaded at 35 in the body 10 and an eccentrically positioned stroke control pin 36 formed in the inner end of the stroke control rockshaft 37 journaled on a suitable bore 38 formed in the body 10 to be rocked by its control handle 39 to swing about an axis 40. A screw 41 threadedly mounted in the body 10 and extending into the annular groove 42 serves to demountably secure the rockshaft 37 in adjusted operative position.

It will be noted that by swinging the rockshaft 37 to desired adjusted positions, FIG. 6, the distance between the eccentric pin 36 engaging one side of the ball 31 and the underside 33 of the stop screw 34 engaging the other side of the ball may be varied so as to regulate the amount of lost motion travel of the ball 31 in the elongated slot 32 and thereby vary the amount of travel of the plunger 12, over and above the normal fixed lead travel etfected by the spiral groove 29. Maximum stroke position for the eccentric pin 36 would be at 36a. The minimum stroke position of no lost motion for the ball 31 would be at 36b, with the ball held against the under surface 33 of the stop screw 34, intermediate positions being shown at 36 and 360.

While the apparatus herein disclosed and described constitutes a preferred form of the invention, it is also to be understood that the apparatus is capable of mechanical alteration without departing from the spirit of the invention and that such mechanical arrangement and commercial adaptation as fall within the scope of the appended claims are intended to be included herein.

I claim:

1. An adjustable variable delivery pump comprising in combination:

(A) a pump body having a bore,

(B) a plunger rotatably and axially reciprocatable in said bore.

(C) means on said body for rotating said plunger,

(D) variably adjustable means on said body operating with the rotation of said plunger to eflFect changes in the extent of reciprocation of said plunger in said body,

(E) a spiral groove in the periphery of said plunger,

(F) a ball carried in a lost motion slot in said body operatively engaging in said spiral groove,

3 (G) and means on said body engaging said ball adjustable to vary the amount of lost motion of said ball relative to said body.

References Cited UNITED STATES PATENTS 2,896,459 7/1959 Jemison et a1. 230173 3,120,811 2/1964 Jemison et a1. 103157 3,406,636 10/1968 Olson 103157 4 FOREIGN PATENTS US. Cl. X.R. 

